Dual-stack optical data storage medium and use of such medium

Details Dual-stack optical data storage medium and use of such medium Dual-stack optical data storage medium and use of such medium

2003-11-26

2009-10-13

Feild, Joseph H (Department: 2627)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S275200

Reexamination Certificate

active

07602694

ABSTRACT:
A dual-stack recordable optical data storage medium wherein a focused radiation beam having a wavelength λ enters through an entrance face of the medium during recording. The medium includes a substrate, a first recording stack L0, including a recording layer, the first recording stack L0having an optical reflection value RL0and an optical absorption value AL0at the wavelength λ, and a second recording stack L1including a recording layer, the second recording stack L1having an optical reflection value RL1and an optical absorption value AL1at the wavelength λ, and a transparent spacer layer between the recording stacks. The second stack is closer to the entrance face than the first stack. By fulfilling the formula AL1≦1−Rmin−√(Rmin/RL0), where Rminis the minimum effective optical reflection value for each recording stack, full compatibility is achieved with a read only version of the medium.

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